AOA System.

AOA CHECK The AOA system calculates the optimum AOA for approach considering the gross weight andconfiguration of the aircraft. At the optimum approach AOA, the IAS will be greater for a greater grossweight. The aircraft gross weight calculation begins with the zero fuel weight, which is approximately10,400 pounds and includes trapped fuel, oil, and two aircrew. (See NATOPS chapter 1 and the PocketChecklist.) To ensure the AOA is indicating properly during deceleration, the pilot should compare theindicated AOA to the IAS computed from the gross weight. Using the NATOPS pocket checklist, at 17units AOA, the T-45 airspeed should be 116 +/- 2 KIAS at 11,400 lb gross weight (1,000# of fuelremaining). Add or subtract 2.5 kts for every 500# above or below a gross weight of 11, 400#. Add 5KIAS for every 1,000# of additional gross weight above 11,400# or subtract 5 kts if the gross weight is1,000# less than 11,400#.

AOA COMPONENTS The AOA probe rotates to balance the pressure in its slots (Figure 63). The probe senses the relativewind and sends the probe angle to both cockpit AOA indicators and the airborne data recorder for the ADIdisplay and head-up display (HUD). The AOA indicator, ADI, and HUD display the AOA to the pilot inunits from 0 to 30

AOA INDICATOR The AOA indicator (Figure 63) provides optimum approach and other airspeed information. On all Navyaircraft, the optimum approach speed is with the needle at precisely three o’clock on the AOA indicator.

Indicators or bugs on the face of the AOA indicator highlight the maximum endurance (14 units) andmaximum range (12-13 units depending on gross weight). Max range airspeed decreases withdecreasing gross weight. The off flag indicates the AOA indicator is out of service

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